brandvein



J. M. BRANDVEIN. CALCULATING MACHINE. APPLICATION FILED FEB.18, 1920.

2 SHEETS-SHEET I.

Patented Mar. 15, 1921.

DRIVE DRIVEN PULLEY SPEED DRIVE SPEED 35E;

INVENTO/i m ATTORNEYS showing the columns of numerals thereon moon 1:. BRANDVEIN, or NEW YORK, N. Y.

CALCULATING-MACHINE.

Specification of Letters Patent. Patented Mar, 15, 1921.

Application filed FebruarylB, 1920. Serial No. 359,492.

T 0 all whom it may concern:

Be it known that I, J ACOB M. BRANDVEIN, acitizen of the United States, and a' resident of the city of New York, borough of Manhattan, in the county of New York and State of New York, have invented a new and Improved Calculating- Machine, of which the following is a full, clear, and exact description.

This invention relates to improvements in calculating machines, an object of the invention being to provide a small and compact portable device which can be .conveniently and quickly operated to find an unknown factor when other factors are known.

A further object is to provide a simple construction of device which is not liable to get out of order and which can be operated by anyone of average intelligence to ascertain quickly unknown factors which heretofore have required considerable mathematics and have been ascertainable only by mechanical engineers or those skilled in the art.

With these and other objects in view the invention consists in certain novel features of-construction, and combinations and arrangements of parts, as will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings Figure 1 is a plan view illustrating one form of my invention;

Fig. 2 is a view in section on the line 22 of Fig. 1;

Fig. 3 is a view in section on the line 33 of Fig. 2;

Figs. 4 and 5 are broken plan views illustrating opposite runs of the webs A and B forming computing tables;

Fig. 6 is a fragmentary plan view illustrating a modification; and

Fig. 7 is a broken plan view illustrating the webs C and D which I employ in connection with the device shown in Fig. 6.

1 represents a rectangular or oblong casing having a relatively large opening 2 in its front exposing an endless curtain or apron '3, the latter constituting a closure for said opening 2, aswill more fully hereinafter appear. In the casing l a frame 4. is provided which has a central partition 5 dividing the casing into two longitudinal compartments and rollers 6 and 7 are provided at the ends of these compartments and supported on journals 8 which are mounted in the frame 4. The journals 8 adjacent one end of the casing extend beyond the casing and are provided with turn buttons 9 to turn the upper journals 8. It is to be understood that the upper rollers 6 are fixed to the ournals 8 so that when the turn buttons 9 are operated, the rollers 6 will be positlvely turned thereby.

pair of endless webs A and B are mounted on the rollers 6 and 7 at opposite sides. of the partition 5 and the endless curtain 3 above referred to is mounted on rolls 12 and 13 in the respective ends of the casmg l and supported on journal pins 14:.

The upper journal pin 14 extends beyond.

the casing and has a turn button 15 thereon to turn the same, it being understood that the upper roll 12 is fixed to the upper journal pin 14 and turns therewith.

The webs A and B are provided at their outer faces with three vertical columns of figures 16, 17 and 18 respectively, the column 16 being adjacent the inner edge of the web, the column 18 adjacent the outer edge of the web, and the column 17 between the columns 16 and 18. The outer columns of figures 18 which extend entirely around both runs of the webs A and B, constitute complete charts or-scales, while the two columns 16 and 17 constitute a single scale, the inner column 16 constituting a continuation of the numerals of the column 17 and the two columns are provided so as to prevent the necessity of making an extremely long web, thus economizing space and making a more compact dev1ce.

The casing 1 is made with openings 10 and 11 which expose the numerals of the columns 18 on the respective webs A and B as shown clearly in Fig. 1. The apron 3 is provided on one run with openings 19 and 20 which expose the numerals of the columns 16 and on the other run of the apron 3 openings 21 and 22 are provided which expose the numerals of the inner columns 17.

Referring particularly to Fig. 1, it will be noted that the casing 1 is provided above the opening 10 with the caption Drive speed and'above the opening 11 with the caption Driven speed. Between these captions above referred to two other captions;

namely, Driven pulley and Drive pulley tions Drive pulley and Driven pulley register with the columns 16 and 17 of the webs A and B.

The purpose of the device illustrated, in Figs. 1, 2, 3, 4, and 5 is to permit an operator to quickly ascertain the diameter of a drive or driven pulley when the diameter of one pulley is known and also the drive speed and the driven speed are known. It frequently happens in machine shops that it is necessary to determine definitely the diameter of a pulley in order to secure the exact driven speed desiredand when three of the factors are known, as for example, the drive speed, the driven speed desired, and the diameter of one pulley, the diameter of the other pulley can be quickly ascertained by the use of my improved device.

For example, assuming that the drive speed is 17 50, the operator moves the web A by means of the turn button 9 on one of the rollers 6 until the number 1750 of the column 18 of web A is exposed by the opening 10. He next turns the other roller 6 by means of its turn button 9 until the driven speed desired is exposed in the opening 11 and we will assume that the driven speed is 300. The turn button 15 is then operated to move the apron 3 to expose the diameter of the known pulley. We will assume that the diameter of the driven pulley is 22 which may be'inches orvfeet or any other measure. The apron 3 is turned until the opening 21 exposes the numeral 22 on the column 17. This movement of the apron 3 will bring the opening 22 in position to expose the diameter of the drive pulley,

which is the unlmown factor, and as soon as the apron is positioned to indicate the.

known factor, it will simultaneously indicate the unknown factor. It will thus be noted that with my improved device where any three factors are known, the fourth will be indicated when the numbers indicating said factors are properly registered with the openings of the casing and the apron 3. 1

As above stated, the openings 21 and 22 expose the numerals of the center columns 17 so that the apron 3 is moved until either of the openings 21 or 22 register with the factors desired and in the event that neither of these openings register with the factors or numerals desired, a continuous move-.

ment of the apron 3 will bring the openings 19 and 20 around to the front of the casing and one of these openings will expose a known factor and .the other the unknowri' speed of the driven shaft and the speed of one of the pulleys is known and when the numerals of the proper columns are registered with the openings, the fourth factor is found.

In the modification illustrated in Figs. 6 and 7, the apparatus operates precisely as that above described but is for a different purpose. In this modification the casing 1 and apron 3 and all mechanical features of the device are precisely alike as above described. The device is, however, provided with different captions. For example, the opening 10 of the casing 1 is provided with the caption Diameter pulley, the opening 11 provided with the caption Speed shaft and the captions Horse power and Width belt are providedto register with the openings of the apron 3. 7 v The apron 3 of this modification is provided with a pair of additional openings 23 and 24, both of which register with the caption Width belt and the openings 23 and 24 are designed to expose numerals indicating a double ply belt, while the openings 20, 22 expose a numeral indicating a single ply belt. I have used like reference characters to indicate like parts in both forms of my invention.

The webs C and D, which are supported in the casing 1 of the modification indicated in Fig. 6, each have three columns of numerals 16, 17 and 18 arranged as are the columns of the preferred form, but these columns offigures indicate difl'erent factors. The columns of figures'18 of the web C register with the opening 10 and indicate the diameter of the pulley. The column of numerals 18 of the web D register with the opening 11 and indicate the speed of the With this modified form of my invention 1 the unknown factor is usually the width of belt and to find the width of belt, the operator moves the webs C and D and the apron 3 until the known factors are exknown diameter of the pulley is 6, the web C is moved to bring this numeral in register w1th the opening 10. Assuming the posed. As, for example, assuming that the speed of the shaft is known to be 1800, g

, the web D is moved to bring this number in register with the opening 11. The apron 3 is then moved to expose thenumber indicating the known horse power which we will assume to be 80-as indicated in Fig. 6. 3. The openlng 20 will then indicate the width of belt desired which is 18.6 and the opening 23will indicate the width of double ply belt wh1ch is 11.6, so that either the single or double ply belt can be employed to give the width of belt necessary to transmit the given horse power with the known diameter of pulley and speed.

It will thus be noted that with both forms of my invention when three factors are known and exposed, the fourth is simultaneously indicated and this is accomplished without any mathematics whatever and gives the result quickly and with substantial accuracy. 1

Various other slight changes might be made in the general form and arrangement of parts described without departing from the invention, and hence I do not limit myself to the precise details set forth, but consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

I claim:

1. In a calculating machine, a pair of independently movable charts having numerals thereon, a fixed indicator and a movable indicator associated with each of said I charts, means for moving the charts, means for simultaneously moving the movable indicators, the numerals on the charts being so arranged that when three of the indicators indicate numerals representing known quantities, the fourth indicator will indicate the numeral representing the quantity to be determined.

2. In a calculating machine, a pair of independently movable charts having numerals thereon, a pair of fixed indicators, a pair of simultaneously movable indicators, means for moving the charts, means for moving the movable indicators, the numerals on the charts being so arranged than when the two fixed indicators and one of the movable indicators indicate numerals on the charts representing known quantities, the other movable indicator will indicate a numeral representing the quantity to be determined. 1

3. In a calculating machine, a pair of endless webs, columns of numerals on each of said webs, a stationary indicator and a movable indicator associated with each of said webs, and means for moving the webs, the numerals on said webs so arranged that when the stationary indicators indicate numerals on the respective webs representing known quantities, and one of the movable indicators indicates a numeral on one web representing a third known quantity, the

other movable indicator will indicate a numeral on the other web representing the quantity to be determined.

4. A calculating machine comprising a support, a pair of independently movable endless webs having columns of numerals thereon, said webs mounted in the support, a pair of stationary indicators associated with the support, an endless apron, a pair of simultaneousl movable indicators associated with sai apron, the numerals on each web adapted to register with one of the stationary indicators and one of the movable indicators, and said numerals so arranged that when the two fixed indicators indicate numerals on the respective webs representing known quantities, and one of the movable indicators indicates a numeral on one web representing a third known quantity, the other movable indicator will indicate a numeral on the other web representing the quantity to be determined.

5. A device of the character stated comprising a casing, independently movable webs in the casing having columns of numerals thereon, a movable apron having openings therein adapted to disclose certain of said numerals, said casing having openings therein adapted to expose others of said numerals, said numerals so arranged on the webs that when three of said openings expose numerals representing known quantities another of said openings will expose a numeral representing the quantity to be determined.

6. A device of the character stated comprising an open casing, a pair of independently movable endless webs in the casing having columns of numerals thereon, an endless apron having openings therein exposing two columns of said numerals, said casing having openings therein exposing two other columns of said numerals, means for moving said webs so that numerals thereon register with the openings in said casings and indicate two known quantities, means for moving said apron so that one of the openings therein registers with a numeral on one of said webs indicating another known quantity, saidcolumns of numerals so arranged that when the third known quantity is exposed by one opening in the apron the other openlng in the apron will expose the quantit to be ascertained.

, JAG B M. BRANDVEIN. 

